• Product name
    Anti-CD11a antibody [MEM-83]
    See all CD11a primary antibodies
  • Description
    Mouse monoclonal [MEM-83] to CD11a
  • Specificity
    The antibody MEM-83 reacts with CD11a (alpha subunit of human LFA-1), a 170-180 kDa type I transmembrane glycoprotein expressed on B and T lymphocytes, monocytes, macrophages, neutrophils, basophils and eosinophils.
  • Tested applications
    Suitable for: Blocking, Flow Cyt, Functional Studies, IPmore details
  • Species reactivity
    Reacts with: Human
  • Immunogen

    Tissue/ cell preparation (Human). Peripheral blood lymphocytes.

  • Epitope
    The antibody recognizes an unique epitope on CD11a antigen (LFA-1 alpha chain) implicated in activation of LFA-1 complex.
  • General notes

    Abcam is committed to meeting high standards of ethical manufacturing and as such, we will be discontinuing this product, which has been generated by the ascites method, within the next year. We are sorry for any inconvenience this may cause. We would recommend antibody ab52895 as a replacement.



Our Abpromise guarantee covers the use of ab3981 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
Blocking Use at an assay dependent concentration. PubMed: 23039186
Flow Cyt Use a concentration of 1 µg/ml.
Functional Studies Use at an assay dependent concentration. The antibody MEM-83 directly induces the binding of T cells to purified ICAM-1. Using an in vitro-translated CDlla cDNA deletion series, the MEM-83 activation epitope was mapped to the "I" domain of the LFA-1 alpha subunit. The studies have therefore identified a novel LFA-1 activation epitope mapping to the I domain of LFA-1, which could play a role in the regulation of LFA-1 binding to ICAM-1.
IP Use at an assay dependent concentration.


  • Function
    Integrin alpha-L/beta-2 is a receptor for ICAM1, ICAM2, ICAM3 and ICAM4. It is involved in a variety of immune phenomena including leukocyte-endothelial cell interaction, cytotoxic T-cell mediated killing, and antibody dependent killing by granulocytes and monocytes.
  • Tissue specificity
  • Sequence similarities
    Belongs to the integrin alpha chain family.
    Contains 7 FG-GAP repeats.
    Contains 1 VWFA domain.
  • Domain
    The integrin I-domain (insert) is a VWFA domain. Integrins with I-domains do not undergo protease cleavage.
  • Cellular localization
  • Information by UniProt
  • Database links
  • Alternative names
    • Lymphocyte function associated antigen, type 1, alpha subunit antibody
    • Antigen CD11A (p180), lymphocyte function associated antigen 1, alpha polypeptide antibody
    • Antigen CD11A antibody
    • CD 11a antibody
    • CD11 antigen-like family member A antibody
    • CD11a antibody
    • CD11a antigen antibody
    • Integrin Alpha L antibody
    • Integrin alpha-L antibody
    • Integrin gene promoter antibody
    • Integrin, alpha L (antigen CD11A (p180), lymphocyte function associated antigen 1; alpha polypeptide) antibody
    • ITAL_HUMAN antibody
    • Itgal antibody
    • ITGAL protein antibody
    • Leukocyte adhesion glycoprotein LFA 1 alpha chain antibody
    • Leukocyte adhesion glycoprotein LFA-1 alpha chain antibody
    • Leukocyte Adhesion Glycoprotein LFA1 Alpha Chain antibody
    • Leukocyte function associated molecule 1 alpha chain antibody
    • Leukocyte function-associated molecule 1 alpha chain antibody
    • LFA 1 alpha (LFA1A) antibody
    • LFA 1 alpha antibody
    • LFA 1 antibody
    • LFA 1A antibody
    • LFA-1A antibody
    • LFA1A antibody
    • Ly15 antibody
    • Ly21 antibody
    • Lymphocyte function associated antigen 1 antibody
    • Lymphocyte Function Associated Antigen Type 1 alpha antibody
    • lymphocyte function-associated antigen 1, alpha polypeptide antibody
    • p180 antibody
    see all


  • Transmigration of A375 Human melanoma cells, blocked using ab3981.

    Melanoma cells were labeled with 10 µM of lipophilic fluorescent dye for 20 minutes at 37°C. Cells were added to wells containing either 1 µg/ml of isotypic control, or 1 µg/ml of anti-CD11a (ab3981) or anti-CD18 (ab8220) antibodies. Melanoma cells were allowed to migrate at 37°C and 5% CO2 for 48 hours. Migration was observed under a fluorescence microscope.


This product has been referenced in:
  • Yasen A  et al. Release of HIV-1 sequestered in the vesicles of oral and genital mucosal epithelial cells by epithelial-lymphocyte interaction. PLoS Pathog 13:e1006247 (2017). Read more (PubMed: 28241053) »
  • Ghislin S  et al. LFA-1 and ICAM-1 expression induced during melanoma-endothelial cell co-culture favors the transendothelial migration of melanoma cell lines in vitro. BMC Cancer 12:455 (2012). Blocking . Read more (PubMed: 23039186) »

See all 5 Publications for this product

Customer reviews and Q&As

see Landis papers for more details Clone MEM-83 has been reported to uniquely activate LFA-1 to bind ICAM-1. Please see: Landis RC et al. A novel LFA-1 activation epitope maps to the I domain. J Cell Biol 120:1519-27 (1993). PubMed: 7680657 mAb ...

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